v2.9.1-M1

What's Changed

• chore: MiMa latest 2.9.0 by @patriknw in #32205
• test: Harden RemoteConnectionSpec, #32182 by @patriknw in #32206
• build: Replace rsync key by @patriknw in #32209
• Remove Play and Lagom references in the docs by @ennru in #32210
• Remove unnecessary todo from MetrciKeyDSL by @Captain1653 in #32211
• docs: remove more references to Gitter and other outdated things by @ennru in #32212
• doc: Simpler old-version-warning by @johanandren in #32215
• chore: Remove links to Akka Cluster with Docker compose example by @ennru in #32219
• build: CA cert for link checker by @johanandren in #32216
• bump: sbt 1.9.7 (was 1.9.6) by @scala-steward in #32224
• bump: sbt-assembly 2.1.4 (was 2.1.3) by @scala-steward in #32220
• bump: metrics-core, metrics-jvm 4.2.22 (was 4.2.20) by @scala-steward in #32223
• bump: commons-io 2.15.0 (was 2.14.0) by @scala-steward in #32222
• Remove unnecessary todo from ReplicatedAuctionExampleSpec by @Captain1653 in #32225
• build: Add JDK 21 to nightly builds by @johanandren in #32226
• docs: clarify example code of reliable delivery by @Roiocam in #32199
• chore: Include quickstart bumping in release template by @johanandren in #32218
• Remove unnecessary todo from DurableStateStoreRegistry by @Captain1653 in #32207
• chore: Drop old Scala 3 comment (no longer valid) by @johanandren in #32229
• Remove unnecessary todo from SnapshotFailureRobustnessSpec by @Captain1653 in #32230
• chore: fix logging for optional snapshots when deleting events by @sebastian-alfers in #32227
• Remove unnecessary todo from TraversalBuilder by @Captain1653 in #32232
• Remove sigar-loader from "test" config dependencies by @Captain1653 in #32194
• Remove unnecessary todo from PhasedFusingActorMaterializer by @Captain1653 in #32234
• chore: A tiny materializer internals cleanup by @johanandren in #32236
• feat: Allow indirect replication by @patriknw in #32233
• Remove unnecessary todo from DurableDataSpec by @Captain1653 in #32239
• chore: Use JDK 17 in multi-node tests by @patriknw in #32240
• chore: Disable scalafmt for Scala 3 by @patriknw in #32186
• docs: Show an example of Scala 3 union types instead of adapters by @johanandren in #32228
• chore: Harden EventSourcedBehaviorRetentionOnlyOneSnapshotSpec by @patriknw in #32241
• build: Harden flaky Aeron tests in CI by @patriknw in #32242
• feat: Fill gaps in EventWriter via message instead of config by @patriknw in #32237

Full Changelog: v2.9.0...v2.9.1-M1